A self contained, specific wavelength, single beam colorimeter for direct spectrophotometric measurement of the concentration of a given solute in a test sample. An electrical circuit employing a photoconductive cell converts the optical output into a linear, directly readable meter output. The colorimeter is simple to operate and is adapted for use in zero gravity conditions. In a specific application, the colorimeter is designed to analyze the concentration of iodine (I.sub.2) in potable water...

A plurality of test tubes containing specimens are passed successively through a predetermined position. Two monochromatic beams are transmitted alternately along a single path through said predetermined position and through each of the test tubes passing through said predetermined position. The characteristics of the two beams are such that one of them is capable of being absorbed by the specimen and the other substantially incapable of being absorbed. Thus it is possible to obtain an electric ...

The wavelength router comprises two flat waveguides, and these flat waveguides are connected by connecting waveguides. In each flat waveguide, optical path converters are created at connecting sections with the connecting waveguides. The optical path converters convert the light propagation direction in the flat waveguide to the light propagation direction in the connecting waveguides, or perform inverted conversion of this conversion. By this configuration, a compact element with a high wavelen...

A wavelength converter which has simple configuration and can be easily controlled and operated with stability, and used for a long-distance mass optical communication, comprises a waveguide for causing a change of a nonlinear refractive index. The converter includes a delay interference circuit having two optical paths and of different optical path lengths. A CW light source is input into the waveguide. A coherent length determined by a spectral line width of CW light output from the CW light s...

Disclosed is a wavelength converter that is appropriate for long-distance large-capacity optical communication, a wavelength converter according to the present invention includes: waveguides 1 and 2 for producing nonlinear changes in refractive indices; light interaction circuits 3 and 4; and light delay circuits 9 and 10. When an input signal pulse interval is denoted by T.sub.o and a speed at which signal pulse light proceeds through a delay circuit is denoted by v.sub.g, a difference .DELTA.L...

A wavelength monitor 10 having a Michelson interferometer (or Mach-Zehnder) optical system 11 of a spatial light type having optical input from a light source has an interference pattern generating means 12 which inclines the wavefronts of interfering beams of collimated light to generate an interference pattern in the light intensity distribution in an interference light beam planes a first slit 107 and a second slit 108 which are adjustable in position and provided in front of a first photo-de...

Wavelength stability of an optical oscillator has been enhanced by feedback from an external position-sensing detector to control the position or tilt of an intracavity optical element, such as a mirror. The wavelength stability results from stabilization of the intracavity beam position relative to an aperture in the oscillator. The wavelength selectivity of the aperture results from incorporation of a dispersive element in the oscillator cavity that produces a mapping of wavelength to beam pos...

A wavelength router that selectively directs spectral bands between an input port and a set of output ports. The router includes a free-space optical train disposed between the input ports and said output ports, and a routing mechanism. The free-space optical train can include air-spaced elements or can be of generally monolithic construction. The optical train includes a dispersive element such as a diffraction grating, and is configured so that the light from the input port encounters the disp...

Provided is a wavelength converter that makes it possible to improve the S/N ratio of output signal light. In the wavelength converter, optical pump light .lamda..sub.3 output from an optical pump source passes through a first reflector and travels through an optical fiber. Light having wavelengths that differ from the aforementioned wavelength is generated by a nonlinear optical phenomenon at the optical fiber. Of the light, generated light .lamda..sub.4 having a resonant wavelength of a resona...

In an optical device, each of a plurality of radiation sources generates a separate different wavelength output signal to a wavelength locking device wherein a grating device receives the separate wavelength output signals from the plurality of radiation sources. The grating device generates a multiplexed wavelength output signal at a zero diffraction order output port thereof, and resolves separate symmetric wavelength-.delta. and wavelength-.delta. output signals at separate predetermined loca...